The PMO used to oversee the Anti-Poluution Unit, the Corruption Practices Investigation Bureau (CPIB), the District Offices and City Secretariat, the Elections Department, the Residents' Committee, the People's Association, the Port of Singapore Authority, as well as the Public Utilities Board (PUB). However over the years, several departments under its purview were either dissolved or absorbed under the wings of other ministries.
To-date, the PMO oversees the CPIB and the Elections Department. Today, the PMO (HQ) provides logistics and administrative support for the private offices of the PM, SM and the DPM. The PMO (HQ) is accountable to the Secretary to the PM in its day-to-day operations. Apart from providing logistics and administrative support for the PM, the SM and the DPM, PM(HQ) also has other responsibilities which include administering the "Singapore State Arms and Flag and National Anthem Rules"; handling matters relating to national honours and awards; co-ordinating matters relating to Justices of the PEace; processing petitions to the PM and the SM; and organising State functions such as the Chinese New Year Reception and the National Day Rally.
